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aiteh tatseeatrnt fitre;

JAMES W. MALOY, F BOSTON, MASSA'CHUSETTS. Law; Puan No. 71,773, ama mamala- 3, 1867.

IMPROVEMENT IN PRESSURE-GAUGES.

Be it known that I, Jnuns W. MALor, of Boston, in the eounty of Sufl'olk, and State of Massachusetts, have invented a nciv and improved Pressnre-Gaug'e, of which the following is a full,'clear, and exact description, reference being had to the aceompanying drawings, making a part of this spccification, in Which- Figure 1 represents an elevation of a portion of`a firc-'extinguisher to which my 'invention is applied.

Figure 2 is a view of the interior m echanism of the gauge, and also a portion of the top, in p'erspective.

Figure 3 is a top view of a firo-extinguisher, and

F' ure 4 rcpresents the adjustable spring The naturc of my invcntion consists in an arrangement and combination of mechanisin through which a loxible meta'llic diaphragm is made to act upon an index, to show upon the dial the pressure of steam, gas, or other fluid. i

The invention also consists in so constructing and arranging the parts as to enable them to be easily removed altogether for repairs or adjustment, and as readily replaced, without the necessity of removing the easing which contains them.

My :invention isipartieularly adapted to be applied to the soicalled fire-extnguishers which are charged With .a certain kind of gs to he used for extinguishing fires. In these extinguishers the gases with which they are -elarged are lglly compressed, and the apparatus is laid away, all ready for'use when oecasion requires. 'When thus disposed of for any considerable length of time, the gas is liable to escape, and the ext'inguisher is rendered useless in 'any emergency.

By. means of a gauge, as hereinaftcr desc1'ibed,the exact -condition of the gas in the extinguisher may always be determined, so that, in the event of a deficieney at any time, the apparatis may be rech'arged and its eflicicncy be always insured. The device may also be applied to steam-boilers, dtc., for indicating'the pressure of steam. v

Referringto-the drawings, a reprcsents. the easing of a fire-extinguisher, which is of cylindrical form, of any suitable length or diame'ter, and having two openings, c'a, in the top, for the insertion respectivelyof the liscla-gepipc-of the gascs and the gauge. These opcnings are surrounded by a'frame, c c', of different diamcters, and connected together so as to be firmly set in the casing. Fifl'..2 'epresents the gauge on an enlarged scale, and it conssts inv a metnllic casing, b, the bottom of whichis composed of a thin, flexible metallic diaphragm, d, which is curred outwardly, so that any pressure upon its outer surface will force it inwards, more or less, according to the degrce of pressure exe'rted. On the inner surface ofthe diaphragm d rests a button or circnlar plate, e, having a stent, e'f, projeeting upwards and passing Ioosely through an opening in'the base or support of a standard, "9, which latter extendsupwai'ds in the casing b, being maintained in position by'means of the cross-bars l z and m extending across the inside of the case. The stcm e' of the button e supports or lpresses against the short arm of a bent levcr, k, which is fulcrumed in the base or supportf at one side of the lattcr'z The long arm of the lever k extends upwards, and to its upper end is attached, at right angles, a rack, Z, fitted to slide freely in a groo've in a cross-piece, m, attached to the standard-g. To the lower part of the rear of the levcr k is attnched a Spring, k', which extends upwards, and at its free end bears against the inner surface of the casing b, and serves to press the lever k inwnrds. The Spring k' is provided with aslot, so that it canbe 'fixed higher or lower upon the levcr k, in order to adjust it to the pressure required. The rack l engages in a pinion, n, journalled in bearings projecting from the standard g, as shown, .The shaft of thepinionn Projects 'upn'ards' and form's an arbor, on which is fixed a pointer, o, that turns with the pinion. The dialJ is made of paper, properly marked, and attached to n plate which rests upon a threaded ring, s, Which latter also serves to hold in place the grooved cross-piece m. The dial is covered by a sheet of mica, r, seeured in place by the ring t which surmounts the casing b.

The parts, being all put togetler,may be readily inserted'in the easing 6, and are secured by the rings s and; in the same. The casing b isscrewed or otherwise secured in the opening a' of the extinguisher a, the dial being fiush or nearly so Withthe top or surface of the same, so that the apparatus can be moved about' or transported without endangering the gauge. When inserted in its place in the extingisher, the latter may be charged with the required quantity of gas, the pressure of the sane actuating the indicator through the metalli'e diaphragm and eonnecting mechanism, and thns de'termining the amount of gas eo'ntained in ne exting'uisher; Should the gas escape from the extinguisher, the state of the same can always be determined by a glanoe at the indioator, and the proper Steps be immediatelytaken to remedy`the defeet, by refilling the ext'inguisher.

The parts are very simple in their Construction, easily adjusted, and can be readily taken out for repairs, should oocasion require, without the necessity of renoving the easing Z from the extinguisher, or from a boler, or other apparatus to Which it may be at-tached. V l

What I claim as vmy invention, and desire to secure by Letters Patent, is-- 1. The combination with a flexible diaphragm of the button e, 'and stem e', the leverz'Jc, and Spring c', as specified. V

2. I claim the combination of a single lever, ile, rack l, sliding cross-piece m attaehed to the standard g, and pinion n, as and for the purpose set forth.

3. I claim the standard g, and the support f and oross-'pieces L, in connection With the operativeparts of the gauge, so oonstrueted and arranged` as to enable' them to be easily removedvfrom the casingb, by simplyl nnserewing the ring s,v substantially as set forth. 4 A

4. I elaim the attaehment'of a gauge to the top plate of a fire-extinguishe', substantially as speeified. In testiinon)r Whereof, Ihave signed my name to this specifieation in tlepresence'of two subscribing witnes'ses.

- JAMES W. MALQY.

Witnesses:

Jos. H. ADAMs, GEORGE C. FI''z. 

